Eye Physiology
Eye Dimensions
- about 2.5 cm/1in in diameter
- one of the most complicated optic devices in the world
Eye
Functions
- Pupil
- Smaller when it is brighter out (dilates) -
Lens
- Accommodation: changing shape of lens to see near or far
- used to bring things into focus - Retina
- Has millions and millions of neurons
- To capture light (electromagnetic energy)
- Neurons convert electromagnetic signals to electric signals - Optic Nerve
- Electrical signals are sent to the brain - Fovea
- contains only cones - Periphery
- MOSTLY rods